100 Continue
The server has received the request headers and the client should proceed to send the request body.
101 Switching Protocols
The server is switching protocols as requested by the client.
102 Processing
The server has received and is processing the request, but no response is available yet.
103 Early Hints
Used to preload resources while the server prepares a final response.
200 OK
The request succeeded. The meaning depends on the HTTP method used.
201 Created
The request succeeded and a new resource was created as a result.
202 Accepted
The request has been accepted for processing, but the processing has not been completed.
203 Non-Authoritative Information
The returned metadata is not from the origin server but from a local or third-party copy.
204 No Content
The server successfully processed the request and is not returning any content.
205 Reset Content
The server processed the request and asks the client to reset the document view.
206 Partial Content
The server is delivering only part of the resource due to a range request.
207 Multi-Status
Conveys information about multiple resources, for WebDAV responses.
208 Already Reported
Used inside a DAV binding to avoid enumerating the members of multiple bindings.
226 IM Used
The server fulfilled a GET request for the resource and the response represents the result of instance manipulations.
300 Multiple Choices
The request has more than one possible response. The user should choose one of them.
301 Moved Permanently
The URL of the requested resource has been changed permanently.
302 Found
The URI of requested resource has been changed temporarily.
303 See Other
The server sends this response to direct the client to get the requested resource at another URI with a GET request.
304 Not Modified
This is used for caching purposes. The response has not been modified, so the client can continue to use the same cached version.
307 Temporary Redirect
The server sends this response to direct the client to get the requested resource at another URI with the same method.
308 Permanent Redirect
The resource is now permanently located at another URI. Same as 301 but the HTTP method must not change.
400 Bad Request
The server cannot process the request due to malformed syntax or invalid parameters.
401 Unauthorized
Authentication is required and has failed or has not yet been provided.
402 Payment Required
Reserved for future use; sometimes used for digital payment systems.
403 Forbidden
The client does not have access rights to the content; the server refuses to give the requested resource.
404 Not Found
The server cannot find the requested resource. The URL is not recognized.
405 Method Not Allowed
The request method is known by the server but is not supported by the target resource.
406 Not Acceptable
The server cannot produce a response matching the list of acceptable values in the request headers.
407 Proxy Authentication Required
Authentication is needed to be done by a proxy.
408 Request Timeout
The server did not receive a complete request message within the time it was prepared to wait.
409 Conflict
The request conflicts with the current state of the server.
410 Gone
The requested content has been permanently deleted from the server, with no forwarding address.
411 Length Required
The server requires the Content-Length header field.
412 Precondition Failed
One or more conditions given in the request header fields evaluated to false.
413 Content Too Large
The request entity is larger than limits defined by the server.
414 URI Too Long
The URI provided was too long for the server to process.
415 Unsupported Media Type
The media format of the requested data is not supported by the server.
416 Range Not Satisfiable
The range specified by the Range header field cannot be fulfilled.
417 Expectation Failed
The expectation indicated by the Expect request header cannot be met by the server.
418 I'm a Teapot
The server refuses to brew coffee because it is a teapot. (RFC 2324 April Fools' joke)
422 Unprocessable Content
The request was well-formed but unable to be followed due to semantic errors.
423 Locked
The resource that is being accessed is locked (WebDAV).
424 Failed Dependency
The request failed because it depended on another request that failed (WebDAV).
425 Too Early
The server is unwilling to risk processing a request that might be replayed.
426 Upgrade Required
The client should switch to a different protocol such as TLS/1.3.
428 Precondition Required
The origin server requires the request to be conditional.
429 Too Many Requests
The user has sent too many requests in a given amount of time ("rate limiting").
431 Request Header Fields Too Large
The server is unwilling to process the request because its header fields are too large.
451 Unavailable For Legal Reasons
The user requested a resource that cannot legally be provided.
500 Internal Server Error
The server encountered an unexpected condition that prevented it from fulfilling the request.
501 Not Implemented
The request method is not supported by the server and cannot be handled.
502 Bad Gateway
The server, while acting as a gateway, received an invalid response from the upstream server.
503 Service Unavailable
The server is not ready to handle the request. Common causes: maintenance or overload.
504 Gateway Timeout
The server, while acting as a gateway, did not get a response in time from the upstream server.
505 HTTP Version Not Supported
The HTTP version used in the request is not supported by the server.
506 Variant Also Negotiates
The server has an internal configuration error with transparent content negotiation.
507 Insufficient Storage
The server is unable to store the representation needed to complete the request (WebDAV).
508 Loop Detected
The server detected an infinite loop while processing the request (WebDAV).
510 Not Extended
Further extensions to the request are required for the server to fulfil it.
511 Network Authentication Required
The client needs to authenticate to gain network access.